a sort of funny story: after having the plumber out to my house three unusually expensive times (when we built an outdoor kitchen, the contractor put the grill and counter over the plumbers access spot on the outer wall. ) they found a black slug , which I knew could not be coffee because 5-6 years ago (when I could get a snake in the outside access (or what ever it is really called) and found the coffee grounds I was putting down the disposal. Know that with strict orders, no one in my family was doing this anymore. my wife was telling the cleaners not to put anything down the disposal anymore. the cleaning lady was replying " yes, yes. I no throw anything down ." at that moment, my wife looked over her shoulder to see her emptying the knock box in the sink.

oh well. i was wondering, would pouring a bunch of Cafiza down the sink help?

I wouldn't expect that much coffee oil in your drainpipes, but I'd figure ground coffee, especially in the form of a compressed puck to be able to clog your sewer, when it builds up after a while, for example in the syphon.

***"This drink of the Satan is so delicious that it would be a shame to leave it to the infidels." (Pope Clement VIII on coffee, when he was urged to ban the beverage)

This is probably the biggest reason I don't do french press. I'm not comfortable washing so much coffee grounds past my sink stainer, down the drain, even with the sink disposer running. I would never wash whole pucks down the drain but I'm not so anal that I won't brush out my grinder over the sink or wash down a few stubborn grounds out of my moka pot filter I couldn't wipe out. That's my comfort level and I've never had a plumber in for a clogged drain.

However, at work, the employees who clean out the huge (5 gallon? percolator) coffee pot dump what grounds they can into the trash but that still leaves a lot of grounds to wash down the sink. I recon the plumber is called in about every 3 months when the drain backs up. The main obstruction is coffee grounds.

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